Most Recent Using Place Value Disks to Model Addition & Subtraction

It’s the beginning of third grade and you’re working on addition and subtraction word problems. Everything seems to be going well, and you feel confident moving on to multiplication and division. The problem? Your students are given an addition and subtraction problem to solve during their morning work and several students get the incorrect answer. Why? Compensation Strategy: Subtraction

In the previous blog post, we talked out how the compensation strategy can help students create simpler addition problems, you can view the blog post about it here. Today, let’s look at how this strategy works in subtraction. Example 1: 800 – 254 You take 1 from 800 and get 799 You then take 1 Let’s talk about compensation. This is a strategy where you manipulate numbers to create friendly numbers. These friendly numbers are easier to add. Example 1: 87 + 399 You take 1 from 87 and move it to 399 Now you have 86 + 400 86 + 400 = 486 You’ve now made a simpler problem Why use math sorts? Discussions Differentiation Aligned to the standards No-prep FUN! 1. Discussions We constantly tell students to show their work or explain their thinking. Using math sorts weekly will give students practice in putting their thinking into words. Your students will use math vocabulary as they explain how they sorted their cards. They  